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Ravenscourt Engineering Ltd

Electron beam welding can weld the same materials as more conventional techniques but generally provides far superior quality. In addition, it provides: The ability to weld several centimetres in thickness in one operation . Precise control over penetration and dimensions . Freedom from impurities because of the high vacuum environment . A very high level of repeatability that's not dependent on manual skills. Minimum distortion and shrinkage with very little heat being dissipated into the surrounding materials. The ability to weld close to heat-sensitive components. The capability of welding in otherwise inaccessible locations. The electron beam is capable of travelling over a metre through the vacuum chamber. This unique capability is used both in repair work and fabrication, and can be especially useful in salvaging intricate castings and machined items. Some of these benefits are unique to Electron Beam Welding. Welding Principle Electron beam welding is a fusion joining process in which the joint to be welded is bombarded with a finely focused stream of high velocity electrons. A heated tungsten filament emits electrons that are accelerated by high voltage to a speed of over 100,000 miles per second. This stream, focused into a beam of 0.2mm diameter, produces power intensities 5,000 times greater than those achieved by conventional arc welding. This can produce deep, parallel sided welds requiring as little as 2.5% of the heat required to produce the same depth as conventional techniques. Weld speeds are also much higher, 125cm per minute being typical. Beam power is controlled by a filament current that governs the rate of electron emissions, and accelerating voltage which controls the kinetic energy of the electrons. It is focused by electromagnetic coils, alignment being adjusted to coincide with cross hairs on a coaxial viewing system. Weld joints are aligned optically and passed under the stationary beam position at a predetermined speed. Therefore we have repeatable machine based limits and controls for all factors affecting performance. The whole beam generation and welding process is carried out in a vacuum without using filler material, welds being a remelt of the component material. Joint Design E B welding can accommodate butt, corner, lap and edge joints and 'T' section. Joints can be linear, circumferential or circular. The designer must consider easy location of parts to be welded, minimising tooling and speeding up the welding cycle. Please note the weld face preparation, unlike conventional welding, relies on the two mating surfaces being square faced and to a good tolerance.

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